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1 Norwegian School of Veterinary Science, Department of Reproduction and Forensic Medicine PO Box 8146 Dep., N-0033 Oslo, Norway
2 Agricultural University of Norway, Department of Animal Science, PO Box 5025, N-1432 Ås, Norway
3 Cornell University, College of Veterinary Medicine, Department of Population Medicine and Diagnostic Sciences, Section of Epidemiology, Ithaca, NY, 14853
4 Department of Reproductive Biology, Faculty of Veterinary Medicine, Estonian Agricultural University, 62 Kreutzwaldi Street, 51014 Tartu, Estonia
Relationships among body condition score (BCS), milk constituents, and resumption of postpartum luteal function were studied in 162 lactations of first- and second-parity Norwegian dairy cows. Milk components included acetone, lactose, fat, protein, urea, and ratios of fat to protein and fat to lactose. Milk progesterone concentrations were used to determine intervals from calving to first luteal response (> 5 ng/ml). Intervals to first luteal response were divided into categories of early (
24 d) or late (> 24 d) responses. Higher BCS were observed during wk 4 and 5 postpartum among both first- and second-parity cows with early compared with delayed luteal responses. Second-parity cows with early onset of luteal function also had higher BCS from wk 6 through 12, whereas first-parity cows with early onset of luteal function had higher BCS from wk 13 through 15. Higher acetone levels from wk 2 through 4 postpartum were associated with late luteal response in second-parity cows. Greater milk lactose content during wk 1, 2, 3, 6, 7, and 8 postpartum and higher fat fractions during wk 4 postpartum were related to early luteal response in second-parity cows. Relationships between milk constituents and onset of luteal function were less evident and occurred later postpartum among first-parity cows than among second-parity cows. Measures of weekly milk composites obtained during the early postpartum period and BCS were closely associated with postpartum resumption of luteal function. Acetone and lactose values in milk from the first 4 wk postpartum predicted postpartum luteal function in second-parity cows at a sensitivity of 0.84 and specificity of 0.86.
Key Words: dairy cow • milk constituent • progesterone • reproduction
Submitted on October 26, 2001
Accepted on January 30, 2002
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